I. Introduction
In recent years, with the improvement of people's living standards and the world's leading food companies continuously entering the Chinese market, China's dairy industry has shown a vigorous development trend, in which the consumption of high-quality, highly nutritious milk powder is increasing. Corresponding to this, dry compound milk powder packaging bags, which have a tendency to replace iron cans, have gradually gained a higher and higher market share.
2. Craft route
( 1 ) Material design: aluminum-plastic structure of milk powder packaging bag (usually PET / AL / PE )
In this structure, PET belongs to a stressed layer and has high tensile strength. At the same time, its excellent transparency can fully display the exquisite printing. AL aluminum foil is a barrier layer of light, oxygen and water, which plays a key role in the quality and fragrance of milk powder. The inner PE film is a heat seal layer and a material that directly contacts the milk powder.
Aluminum foil has good moisture, rust, gas barrier, shading and corrosion resistance. It has moderate stiffness and mechanical strength, good ductility, and is easy to process. It can be combined with paper and plastic to make high-barrier, high-temperature resistant aluminum-plastic composite materials. , Suitable for high temperature sterilization packaging, vacuum packaging, etc. The use of aluminum foil composite materials can effectively improve the shelf life of the product and resist the penetration of grease into the packaging.
Aluminum-plastic packaging also has its own limitations. For example, aluminum foil is not resistant to folding. During vacuum packaging or product circulation, aluminum foil is prone to pinholes, perforations, and breakage. After rubbing, the barrier performance of aluminum-plastic packaging is greatly reduced, and even penetrating perforations occur. However, if high barrier layers such as PA and EVOH are added to the composite layer , it can not only protect the aluminum foil, but also keep the barrier property of the material with aluminum foil perforation at a high level. Therefore, when the milk powder needs to be transported for a long distance or the packaging material is easy to squeeze and rub during the storage and transportation process, if you choose this type of packaging, the performance of the material compounded with aluminum foil is crucial. The commonly used milk powder packaging bag composite material design is PET / AL / CPP , PET / AL / PA / CPP , PET / NY / AL / NY / CPP, etc.
In general, the oxygen permeability of aluminum-plastic composite film is less than 12.5px3 / .24h.0.1MPa , and the water vapor permeability is less than 0.5g / .24h . It is a commonly used packaging material for whole milk powder. Relatively speaking, the more composite layers, the better the barrier properties and physical properties, but the higher the cost, and excessively improving the performance of milk powder packaging bags is wasteful and unnecessary. In the design of packaging materials, the packaging should be reasonably selected in accordance with the milk powder processing technology and shelf life requirements.
(2) Material design: plastic-plastic composite film for milk powder packaging bags
Plastic packaging is light in quality, thin in thickness, simple in packaging technology, rich in design types, has good moisture and corrosion resistance, and has been widely used in food and pharmaceutical industries. Full-fat milk powder can be packed in composite plastic, but the material must have good barrier properties. Packaging material design can choose PVDC , PA , EVOH and other materials with high barrier properties as the barrier layer, and PP , PE and other materials with good heat sealing properties as the inner layer of the package. You can choose the packaging material structure such as PA / CPP , PA / LDPE, etc. In general, PA / CPP, oxygen PA / LDPE material through an amount between 40 ~ 1500px3 / .24h.0.1MPa, PA / CPP water vapor transmission rate of about 3g / .24h, PA / LDPE material The water vapor transmission rate is about 4g / .24h , which can meet the shelf-life requirements of general full-fat milk powder products.
Since plastic-plastic composite film substrates are mostly colorless transparent films, in order to slow down the photosensitive oxidation of milk powder, if you do not choose aluminum-plastic composite film or aluminum-plated composite film, you should try to design the package to full color to play the role of shading .
3. Several key issues
( 1 ) Compound strength
In the PET12 μm // AL7 μm // PE70 μm structure, the peeling force of each layer directly affects the sealing strength of the composite film. As mentioned above , after using the above PE film, as long as the corona of the PE film is guaranteed The strength is between 38-40dyn / cm , the sizing amount is 2.5-3.5g / m2 , the curing temperature is 45-50 ℃, and the curing time is 48 hours, it can ensure that the composite strength between the AL layer and PE is no problem. However , the composite strength between PET and AL is a weak link. Experiments have shown that under normal process conditions, if the corona strength of PET is only 45dyn / cm , the ink layer will transfer to the AL surface, and the peeling force is extremely low. To this end, increase the PET corona strength to 50dyn / cm , can avoid the appearance of ink wind, the test result is not peelable (PET tear ) .
( 2 ) Odor
Milk powder products are very sensitive to the odor of packaging materials. Serious foreign odor will change the flavor of milk powder and even endanger the health of consumers. There are two main sources of compound film odor: one is residual solvent, and the other is PE resin. The two issues are explained below.
1. Control of residual solvents
Residual solvents come from printing and compounding processes. At present, gravure printing basically uses benzene ink, and the solvents are toluene, ethyl ester and methyl ethyl ketone. Due to the heavy odor of methyl ethyl ketone, ink suppliers may be required to ban it. Reasonably set the temperature and exhaust volume of the drying oven. The gradation version is set at 55--60 ℃, and the large-area full-page printing is set at 70-85 ℃. The inlet air pressure and exhaust air pressure are not as large as possible ( excessively causing ink layer scratches or broken film ) , but to balance the two. Under conditions permit, and then non-transport 1-- after winding unit 2, can minimize residual solvent.
2, PE resin odor
The control of resin odor is mainly considered from two aspects. One is the processing temperature. Excessive temperature will oxidize the resin and produce odor. Generally speaking, the odor of blown PE film is much lower than that of extruded cast film. The second is the precipitation of low-molecular substances such as plasticizers, slip agents or other additives in the resin. In this regard, it is necessary to seek the support and advice of resin suppliers.
Through the control of the aforementioned several key points, the quality of the packaging materials fully meets the user's requirements and has achieved good economic benefits.
At the beginning of December 16th , the General Office of the State Food and Drug Administration issued the “Notice on the Standardization and Supervision and Inspection of Label Labels for Infant and Infant Formula Milk Powder†(hereinafter referred to as the “Noticeâ€), requiring enterprises to develop label labels for infant and formula milk powder Self-examination.
The "Notice" mentions seven aspects of labeling inspection of infant formula milk powder, including functional expressions that may not express or imply to have intelligence, increase resistance or immunity, protect the intestine, etc .; "imported milk sources" shall not be used Ambiguous information such as "derived from foreign pastures" and "ecological pastures"; "human emulsification", "mother emulsification" or similar terms should not be used on the label.
In response, the reporter investigated online and offline infant milk powder for sale, and found that some brands wrote "contribute to the normal development of infant vision" on the packaging, and some introductions said "give the baby nutrition, absorption, and digestion. , Immune, intellectual five-dimensional system is natural, safe and complete care ", and some brands emphasize" affinity to the human body ". On some e-commerce platforms, some infant milk powder brands use the terms "imported milk source" and "purely close to breast milk" in advertising.
Several treasure moms said that they did not know which nutritional elements have the function of nourishing or improving immunity, but some functional expressions on the packaging and the words "from foreign pastures" did have certain temptations.
This is not the first time that the State Food and Drug Administration has made provisions on the labeling of infant formula milk powder. In June this year, the State Food Drug Administration issued what is known as "the history of the most serious" of "infant formula milk powder products recipe Registration" (hereinafter referred to as the "Rules"), since October 1, 2016 implementation, transitional period until 1 January 2018.
The "Measures" require applicants to submit samples of labels and instructions together with the labels, instructions and certification materials claimed in the instructions, and make detailed provisions on the requirements of the labels and instructions. This includes information such as the prohibition of "puzzle" and "mother emulsification".
The "Measures" called "Milk Powder New Deal" transition period to 2018 , why start labeling actions now?
"Standardizing labels is to prepare for the official implementation of the new policy of milk powder and to" make a stop "for the new policy," Wang Dingmian said. Enterprises should have an adaptation process during the transition period. If label violations still exist after 2018 , production qualifications may be cancel.
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